Add flake-parts module

flake-module.nix

@@ -0,0 +1,11 @@
+{
+  lib,
+  ...
+}:
+{
+  options.flake.darwinConfigurations = lib.mkOption {
+    type = lib.types.lazyAttrsOf lib.types.raw;
+    default = { };
+    description = "Darwin system configurations";
+  };
+}

flake.nix

@@ -56,6 +56,8 @@
       darwin-uninstaller = prev.callPackage ./pkgs/darwin-uninstaller { };
     };
 
+    flakeModules.default = ./flake-module.nix;
+
     darwinModules.hydra = ./modules/examples/hydra.nix;
     darwinModules.lnl = ./modules/examples/lnl.nix;
     darwinModules.simple = ./modules/examples/simple.nix;